Ruby Kaiyama

She is obsessed with "perfect environments." In the killing game, she might be seen constantly checking the humidity of rooms or complaining if the air conditioning is too dry. Ruby grew up in a coastal town where she noticed tourists mistreating hermit crabs. She dedicated her life to rescuing them, eventually managing a massive "Crabitat" sanctuary with hundreds of species. Despite her "hermit" nature, she is deeply social with those she trusts, mirroring how hermit crabs actually thrive in groups rather than alone.